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Electronics help! Need to make an auto switch delay (for a small bartop project)

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protokatie:
555 timer! W00T! I have dealt with them before (albeit in a 500 in 1 electronics kit designed for us "kids" to learn about electronics).

I would have suggested a capacitor with a relay myself, but go with the timer IC as it would be cleaner.

Bender:

--- Quote from: protokatie on November 23, 2009, 09:51:32 pm ---555 timer! W00T! I have dealt with them before (albeit in a 500 in 1 electronics kit designed for us "kids" to learn about electronics).

I would have suggested a capacitor with a relay myself, but go with the timer IC as it would be cleaner.

--- End quote ---

can you explain the capacitor w/ relay and what a timer IC is

assume I'm  a little slow (cause I am)

one other thing, I need this to be as cheap as possible I'm trying to bring the whole project in at $100 or less

DillonFoulds:
555 timer ICs are somewhat common among electronics hobbyists. Basically, and i mean very basic, it's an IC that you can set up with a trigger or variable resistor to control the internal timing clock. Someone jump in and correct me if I'm wrong here

It's useful for an automated looping event, such as rapid-fire buttons in a game controller.

I'm not 100% on this, memory's a bit hazy. Maybe there was a crystal in place of a variable resistor. I'm fairly certain you can find these ICs in common electronics stores.
RatShack has them, too! Also their big brother the 556, which is essentially 2x 555s in one IC.

Beley:
Another idea you may want to think about is modifying a standard "LED chaser" or "LED sequencer" you can usually find these as kits. you would only need to cut one connection and add a jumper.  below is a generic circuit and then one showing the changes needed to make it do what you want

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